Breathing fire is read as powerful expression — words or passion that come out with great force. Dream books note the mix of spectacle and risk in letting that heat out.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.